'On' in this case is 'we', so the past participles agrees in plurality, a bit quirky but correct...
On is like il or elle in terms of conjugating the verb.
Take a look at the following lesson for examples
and in particular the green box :
Hope this helps!
But ètre is still singular, 'On est partis tôt.'? Is it correct when 'On' is 'we', the past participle is in plural form, but ètre is in third person singular form.
Vous êtes parti and vous êtes partis are both accepted as vous can be singular or plural. The form of être doesn’t change, just the past participle. We just need to think of “on” the same way, it can have a singular or plural meaning, still followed by “est”, but a past participle that changes with plurality.
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